+.. function:: fsencode(value)
+
+   Encode *value* to bytes for use in the file system, environment variables or
+   the command line.  Use :func:`sys.getfilesystemencoding` and
+   ``'surrogateescape'`` error handler for str, and keep bytes unchanged.

I'd word the latter sentence as:

Uses :func:`sys.getfilesystemencoding` and ``'surrogateescape'`` error handler for strings and returns bytes unchanged.


Otherwise I think this patch looks good.  +1